The '''American Ornithologists' Union''' ('''AOU''') is an ornithology|ornithological
organization based in the United States. Its members are primarily professional ornithologists although membership is open to anyone with an interest in birds. The AOU is a member of the Ornithological Council
and Ornithological Societies of North America (OSNA).
The Union publishes the scholarly journal ''The Auk
'' as well as the ''AOU Checklist of North American Birds